I'm just going to play devil's advocate here, just for the sake of discussion, not because I believe it or not, but I think you could argue that obtaining ROMs for games you own is not ethical. The "phase shifting" argument is never one that held much water legally and certainly the industry would argue that if you want to use the content in a different form (i.e. an emulator), that you should pay for that additional right. It is a copy, after all. In the same way that the music industry would argue you can't upgrade all your vinyl records to mp3 without paying again. For example, should I be able to get Photoshop for all available platforms just because I happen to own one copy?

This, of course, brings us into the thorny world of whether copyright even makes sense in the software business. Copying seems to be an essential part of using a computer (copying runtimes into memory, caching web pages to your computer, etc.) so it may be an outmoded way of thinking about protecting IP.

ethics != law